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new draft: tailscale-serve-docker-compose-sidecar
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content/posts/tailscale-serve-docker-compose-sidecar/index.md
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content/posts/tailscale-serve-docker-compose-sidecar/index.md
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---
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title: "Tailscale Serve in a Docker Compose Sidecar"
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date: 2023-12-28
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# lastmod: 2023-12-28
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draft: true
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description: "This is a new post about..."
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featured: false
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toc: true
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comment: true
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series: Tips # Projects, Code
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tags:
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- containers
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- docker
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- selfhosting
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- tailscale
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---
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Hi, and welcome back to what has become my [Tailscale blog](/tags/tailscale/).
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I have a few servers that I use for running multiple container workloads. My approach in the past had been to use [Caddy webserver](https://caddyserver.com/) on the host to proxy the various containers. With this setup, each app would have its own DNS record, and Caddy would be configured to route traffic to the appropriate internal port based on that. For instance:
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```text
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# torchlight! {"lineNumbers": true}
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cyberchef.runtimeterror.dev {
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reverse_proxy localhost:8000
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}
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ntfy.runtimeterror.dev, http://ntfy.runtimeterror.dev {
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reverse_proxy localhost:8080
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@httpget {
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protocol http
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method GET
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path_regexp ^/([-_a-z0-9]{0,64}$|docs/|static/)
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}
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redir @httpget https://{host}{uri}
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}
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uptime.runtimeterror.dev, status.vpota.to {
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reverse_proxy localhost:3001
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}
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miniflux.runtimeterror.dev {
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reverse_proxy localhost:8080
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}
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```
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*and so on...* You get the idea. This approach works well for services I want/need to be public, but it does require me to manage those DNS records and keep track of which app is on which port. That can be kind of tedious.
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And I don't really need all of these services to be public. Not because they're particularly sensitive, but I just don't really have a reason to share my personal [Miniflux](https://github.com/miniflux/v2) or [CyberChef](https://github.com/gchq/CyberChef) instance with the world at large. Those would be great candidates to serve with [Tailscale Serve](/tailscale-ssh-serve-funnel#tailscale-serve) so they'd only be available on my tailnet. Of course, with that setup I'd have to differentiate the services based on external port numbers since they'd all be served with the same hostname. That's not ideal either.
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```shell
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sudo tailscale serve --bg --https 8443 8180 # [tl! .cmd]
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Available within your tailnet: # [tl! .nocopy:6]
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https://tsdemo.tailnet-name.ts.net/
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|-- proxy http://127.0.0.1:8000
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https://tsdemo.tailnet-name.ts.net:8443/
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|-- proxy http://127.0.0.1:8080
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```
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It would be really great if I could directly attach each container to my tailnet and then access the apps with addresses like `https://miniflux.tailnet-name.ts.net` or `https://cyberchef.tailnet-name.ts.net`. Tailscale does provide an [official Tailscale image](https://hub.docker.com/r/tailscale/tailscale) which seems like it should make this a really easy problem to address. It runs in userspace by default (neat!), and [even seems to accept a `TS_SERVE_CONFIG` parameter](https://github.com/tailscale/tailscale/blob/5812093d31c8a7f9c5e3a455f0fd20dcc011d8cd/cmd/containerboot/main.go#L43) to configure Tailscale Serve... unfortunately, I haven't been able to find any documentation about how to create the required `ipn.ServeConfig` file to be able to use of that. I also struggled to find guidance on how to actually connect a Tailscale sidecar to an app container in the first place.
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And then I came across [Louis-Philippe Asselin's post](https://asselin.engineer/tailscale-docker) about how he set up Tailscale in Docker Compose. When he wrote his post, there was even less documentation on how to do this stuff, so he used a [modified Tailscale docker image](https://github.com/lpasselin/tailscale-docker) with a [startup script](https://github.com/lpasselin/tailscale-docker/blob/c6f8d75b5e1235b8dbeee849df9321f515c526e5/images/tailscale/start.sh) to handle some of the configuration steps. His repo also includes a [helpful docker-compose example](https://github.com/lpasselin/tailscale-docker/blob/c6f8d75b5e1235b8dbeee849df9321f515c526e5/docker-compose/stateful-example/docker-compose.yml) of how to connect it together.
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I quickly realized I could probably modified his startup script to take care of my Tailscale Serve need. So here's how I did it.
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### Docker Image
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My image will start out the same as Louis-Philippe's, with just adding a startup script to the official Tailscale image:
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```Dockerfile
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# torchlight! {"lineNumbers": true}
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FROM tailscale/tailscale:v1.56.1
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COPY start.sh /usr/bin/start.sh
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RUN chmod +x /usr/bin/start.sh
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CMD "start.sh"
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```
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The `start.sh` script has a few tweaks for brevity/clarity, and also adds a block for conditionally enabling a basic Tailscale Serve configuration:
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```shell
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#!/bin/ash
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# torchlight! {"lineNumbers": true}
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trap 'kill -TERM $PID' TERM INT
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echo "Starting Tailscale daemon"
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tailscaled --tun=userspace-networking --state=${TS_STATE} ${TS_OPT} &
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PID=$!
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until tailscale up --authkey="${TS_AUTHKEY}" --hostname="${TS_HOSTNAME}"; do
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sleep 0.1
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done
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tailscale status
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if [ -n "${TS_SERVE_PORT}" ]; then # [tl! ++:4]
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if ! tailscale serve status | grep -q "${TS_SERVE_PORT}"; then
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tailscale serve --bg "${TS_SERVE_PORT}"
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fi
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fi
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wait ${PID}
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```
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```yaml
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services:
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tailscale:
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build:
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context: ./image/
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container_name: tailscale
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environment:
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TS_AUTH_KEY: ${TS_AUTH_KEY:?err} # from https://login.tailscale.com/admin/settings/authkeys
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TS_HOSTNAME: ${TS_HOSTNAME:-ts-docker}
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TS_STATE_ARG: "/var/lib/tailscale/tailscale.state" # store ts state in a local volume
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TS_SERVE_PORT: ${TS_SERVE_PORT:-} # optional port to proxy with tailscale serve (ex: '80')
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volumes:
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- ./ts_data:/var/lib/tailscale/
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cyberchef:
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container_name: cyberchef
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image: mpepping/cyberchef:latest
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restart: unless-stopped
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network_mode: service:tailscale
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```
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```shell
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DB_USER=my_db_user
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DB_PASS=my_db_password
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ADMIN_USER=my_admin_user
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ADMIN_PASS=my_admin_password
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TS_AUTH_KEY=tskey-auth-my_auth_key
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TS_HOSTNAME=miniflux
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TS_SERVE_PORT=8080
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```
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```yaml
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services:
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tailscale:
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image: ghcr.io/jbowdre/tailscale-docker:latest
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container_name: miniflux-tailscaled
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environment:
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TS_AUTH_KEY: ${TS_AUTH_KEY:?err} # from https://login.tailscale.com/admin/settings/authkeys
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TS_HOSTNAME: ${TS_HOSTNAME:-ts-docker}
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TS_STATE_ARG: "/var/lib/tailscale/tailscale.state" # store ts state in a local volume
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TS_SERVE_PORT: ${TS_SERVE_PORT:-} # optional port to proxy with tailscale serve (ex: '80')
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volumes:
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- ./ts_data:/var/lib/tailscale/
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miniflux:
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image: miniflux/miniflux:latest
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container_name: miniflux
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depends_on:
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db:
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condition: service_healthy
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environment:
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- DATABASE_URL=postgres://${DB_USER}:${DB_PASS}@db/miniflux?sslmode=disable
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- RUN_MIGRATIONS=1
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- CREATE_ADMIN=1
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- ADMIN_USERNAME=${ADMIN_USER}
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- ADMIN_PASSWORD=${ADMIN_PASS}
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network_mode: "service:tailscale"
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db:
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image: postgres:15
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container_name: miniflux-db
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environment:
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- POSTGRES_USER=${DB_USER}
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- POSTGRES_PASSWORD=${DB_PASS}
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volumes:
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- ./mf_data:/var/lib/postgresql/data
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healthcheck:
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test: ["CMD", "pg_isready", "-U", "${DB_USER}"]
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interval: 10s
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start_period: 30s
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```
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